What is the correct rollback action if a PowerStore OE upgrade introduces instability?

The PowerStore Operating Environment (OE) upgrade process is designed to be non-disruptive and includes a supported rollback capability. If an upgrade results in system instability, the designed and recommended first course of action is to revert to the previous, stable OE version. The system retains the prior software package specifically for this purpose, allowing administrators to perform a non-disruptive rollback to restore normal operation. This procedure avoids more drastic measures like hardware replacement or a full system re-initialization, minimizing downtime and operational impact.

B. Replace both controllers: This is an extreme hardware-level intervention for what is a software-induced problem and is not the standard recovery procedure.
C. Disable one node permanently: This action would cripple the system's high-availability architecture and does not address the root software instability issue.
D. Reinstall PowerStore OS manually: This is a highly disruptive, potentially data-destructive action considered a last resort, not the standard procedure for reverting a problematic upgrade.

1. Dell PowerStore: Software Upgrade Guide (Version 3.6): In the "Upgrading PowerStore T model clusters" section, the guide details the non-disruptive upgrade (NDU) process. The concept of retaining the previous package for recovery is fundamental to this design. The "Post-upgrade health checks" subsection implies that if checks fail, remediation, including a potential rollback managed by support, is the next step. (Reference pertains to the overall NDU design which includes rollback capabilities).

2. Dell PowerStore: Service Concepts Guide: This guide explains the system's architecture, including the dual-controller, high-availability design. It details how software updates are managed to maintain service. The rollback feature is a key part of this serviceability design, allowing the system to revert to a known-good state without a complete re-initialization. See the chapter on "Software and Firmware Updates" for architectural context.

3. Dell Knowledge Base Article 000192070, "PowerStore: How to perform a Health Check before a PowerStoreOS upgrade...": While focused on pre-checks, this and related articles on the upgrade process emphasize the non-disruptive nature of the procedure. The rollback is the implicit safety net of the NDU process, to be used if post-upgrade health checks or system stability is compromised. The procedure is typically performed with the assistance of Dell Support.